Composite Control Strategy for Constant Output Regulation of Dynamic Wireless Charging System in Electric Vehicles

This article proposes a novel control scheme for the output voltage regulation of electric vehicles (EVs) dynamic wireless charging (DWC) systems based on integral terminal sliding mode control (ITSMC) and finite time disturbance observer (FTDO). In the DWC system, due to EV movement, the coupling coefficient between primary and secondary coils varies, which leads to severe output voltage fluctuation in the DWC system. Thus, the wireless charging performance of the DWC system deteriorates. To compensate for the disturbances arising from the coupling coefficient variation and load resistance uncertainties, a disturbance observer-based ITSMC control strategy is proposed for the secondary side of the DWC system. To verify the effectiveness of the proposed control, a DWC prototype is built. Then, the proposed FTDO-based ITSMC and double proportional-integral (PI) control methods are compared with both simulation and experiments. The results verify that the proposed control could reduce the DWC system output voltage fluctuation from 5.27% to 1.66% compared with the conventional double PI control.